Remove base/memory/scoped_handle.h from BUILD.gn.

This file went away in https://codereview.chromium.org/324773002

Review URL: https://codereview.chromium.org/372783003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@281940 0039d316-1c4b-4281-b951-d872f2087c98

base/BUILD.gn

@@ -316,7 +316,6 @@ component("base") {
     "memory/ref_counted_delete_on_message_loop.h",
     "memory/ref_counted_memory.cc",
     "memory/ref_counted_memory.h",
-    "memory/scoped_handle.h",
     "memory/scoped_open_process.h",
     "memory/scoped_policy.h",
     "memory/scoped_ptr.h",